Re: [Discuss-gnuradio] Synchronisation

[Dan CaJacob]

I could be wrong, but I thought the SBX was one of the few daughter cards that starts with s known phase offset?

On Sun, Sep 10, 2017, 2:49 PM Fulcrum Associates <address@hidden> wrote:

Dear All,

              I have a couple of USRPs connected, through  a strong
attenuator to a signal generator (NWT4001). While the units have a MIMO
option, I don't have that cable. (Option A) When I run the GRC as
attached, I see too good a result to the extent that the differential
Phi seems to range over +/- 5 degrees.


              What I had hoped to prove to myself that two N200 with SBX
would have a varying offset without MIMO cable, then I would connect the
MIMO cable and move the USRPs into a multi-unit and enable GPSD O/B on
the unit which has the feature and MIMO for one without (Option B) and
that the phase differential would improve noticeably and be a variable
constant, but it didn't.


               If it had, but there still was a fixed phase offset which
varied each time it was setup (which is what I would expect under B)
then I would hand-code the SBX stream initialisation code to remove the
offset.


               Does my FG not measure what I claim to be wishing to
measure?

               If it does measure it correctly, why do my expectations
of options A and B leading to a different (though improved) situation
not eventuate?


               Kind Regards,


                              John

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Very Respectfully,

Dan CaJacob